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Evrard, C., Fouquet, Y., Moelo, Y., Rinnert, E., Etoubleau, J. & Langlade, J. A. (2015) Tin concentration in hydrothermal sulphides related to ultramafic rocks along the Mid-Atlantic Ridge: a mineralogical study. Eur. J. Mineral. 27 627–638. 
Added by: Laurent Cournède (2016-03-10 18:36:41)
Type de référence: Article
DOI: 10.1127/ejm/2015/0027-2472
Numéro d'identification (ISBN etc.): 0935-1221
Clé BibTeX: Evrard2015
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Catégories: MIOPS
Mots-clés: chalcopyrite, deposit, geochemistry, geology, hydrothermal sulphides, identification, kesterite, kidd creek mine, massive sulfides, microprobe, microprobe analysis, Mid-Atlantic Ridge, mineralization, Raman micro-spectroscopy, raman-spectroscopy, Sn, Solid solution, sphalerite, stannite, tin, ultramafic rocks
Créateurs: Etoubleau, Evrard, Fouquet, Langlade, Moelo, Rinnert
Collection: Eur. J. Mineral.
Consultations : 7/554
Indice de consultation : 1%
Indice de popularité : 0.25%
Résumé     
Hydrothermal polymetallic sulphides collected along the Mid-Atlantic Ridge and hosted in ultramafic rocks (Ashadze, Logatchev and Rainbow ore fields) are enriched in Sn compared to sulphides associated with volcanic rocks. At Logatchev, the averaged Sn ore concentration reaches 2000 ppm. The distribution of Sn among sulphides was studied using scanning electron microscopy and electron-microprobe analysis. The Sn concentration can reach up to 6 wt.\% in sphalerite and 2 wt.\% in chalcopyrite. Raman micro-spectroscopy investigation suggests that most of Sn is carried by stannite micro-inclusions in sulphides. According to the mineralogical and chemical studies, the following paragenetic sequence is proposed: (1) Sn ({<}1 wt.\%) first precipitates as solid solution in low-temperature sphalerite; (2) at high temperature (300 degrees C) and low pH (similar to 3) sphalerite is replaced by chalcopyrite; Sn, previously contained in the low-temperature sphalerite, contributes to the formation of stannite, as micro-inclusions in the replacement front; (3) eventually Sn is distributed within newly formed chalcopyrite ({<}1 wt.\%). Tin enrichment of Zn-Cu ores appears as an indicator of hydrothermal reworking of ultramafic sulphide deposits.
Added by: Laurent Cournède  
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